Research Silver and Silverplate Marks

Do you know that there are marks on the bottom of silver and silverplate items that tell you who made it and if it's sterling or silverplate? Did you know that all this information is on the internet if you do a google search for silverplate marks? It was fun finding out that my 'plate" thing was silverplate from a Connecticut firm which closed in 1939, and that my pitcher thing was English Sheffield Ware (Fenton Bros - date?)